B4J Question Capturing confirm dialogs in webview

Teleboy20 · Jun 19, 2016

Hello all,

After much reading of the forum and javadocs, I've come to the conclusion that I have no clue how to capture dialogs from a webview. I've been trying to utilize setConfirmDialog, but haven't had any success. I'm using a javaobject with the webengine to run the method, but am unsure what steps are needed (creat e an event, callbacks etc.). Any assistance is greatly appreciated. Sample code would be even better.

Thanks in advance, RickT

Daestrum · Jun 19, 2016

Small example that handles a button on a web page that calls window.confirm() routine.
needs JavaObject Library
The handler setting and dialog display handled in pure java.

Hope it helps.

B4X:

Sub Process_Globals
    Private fx As JFX
    Private MainForm As Form
    Dim wv As WebView
End Sub

Sub AppStart (Form1 As Form, Args() As String)
    MainForm = Form1
    MainForm.SetFormStyle("UNIFIED")
    'MainForm.RootPane.LoadLayout("Layout1") 'Load the layout file.
    wv.Initialize("")
    MainForm.Show
    MainForm.RootPane.AddNode(wv,10,10,100,100)
    ' call the inline java
    ' with webview as the argument
    inLine("setConfHandler",Array(wv))
    ' load the htnl - just a button that calls window.confirm()
    wv.LoadHtml($"<html><input type="button" width="200" value="Confirm Test" onclick="window.confirm()"></html>"$)
End Sub
Sub inLine(method As String,Args() As Object)
    asJO(Me).RunMethod(method,Args)  
End Sub
Sub asJO(o As JavaObject)As JavaObject
    Return o
End Sub
#if java
import javafx.util.Callback;
import javafx.scene.web.WebView;
import javafx.scene.web.WebEngine;
import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;
import java.util.Optional;
import javafx.scene.control.ButtonType;

// set the handler
public static void setConfHandler(WebView wv){
    WebEngine we = wv.getEngine();
    we.setConfirmHandler(new Callback<String, Boolean>() {
       @Override public Boolean call(String msg) {
          Boolean confirmed = confirm();
          return confirmed;
           }
      });
}
//show the dialog box
private static boolean confirm(){
    Alert alert = new Alert(AlertType.CONFIRMATION);
    alert.setTitle("Confirmation Dialog");
    alert.setHeaderText("Look, a Confirmation Dialog");
    alert.setContentText("Are you ok with this?");

    Optional<ButtonType> result = alert.showAndWait();
    if (result.get() == ButtonType.OK){
       return true;
    } else {
       return false;
    }
}
#end if

Teleboy20 · Jun 20, 2016

Thank you so much Daestrum! That plugged into my code perfectly. Now to study what you've done. Thanks again.

B4J Question Capturing confirm dialogs in webview

Teleboy20

New Member

Daestrum

Expert

Teleboy20

New Member

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